Gas tanks

Lag time fast systems

Sample pressure - fast NOx

Surface O3 concentrations

Fast NOx data

TO DO list:
* Puff system.
* Check fast NOx calibration data.
* Start CO2 on autosampler #1.
* Calibration tank for enclosures.

Tuesday, June 4th

Daily checks

  • Lab temperature = 23.0°C, AC temperature = 68F. Changed AC temperature to 65F at 9:19am local time.
  • Case temperature: fast O3 = ~25.1°C, fast NOx = ~22.5°C.
  • PMT temperature: fast O3 = -34.4°C, fast NOx = -31.7°C.
  • Changed drierite.
  • Fast O3: OK, NO flow rate OK.
  • Fast NOx: OK but high counts (5000-5500).
  • Gas tanks: OK.
  • Fast O3 laptop synchronized with time.nist.gov at 8:22 AST.

Enclosures

  • Enclosure #2 has been running all night, ends at 3:30pm AST. Saved HOBO#2 data at 9:22am AST. At the end of the sequence: checked autosampler flowrate (set = 250 mL/min, Defender = 275 mL/min). Enclosure moved to a different location at ~3:40pm AST.
  • Prepared enclosure #1. Checked flow rate pump (27 L/min) and leak check on the line (autosampler’s flow rate dropped to 0 when cap on line in bag). HOBO#1 started. Checked flow rate autosampler: set = 200 mL/min, Defender = 265 mL/min. We can start sampling BVOCs + CO2 tomorrow.

GC/MS calibration

Using Catie’s tanks.
* Calib B tank: samples TL_20190604_01 and TL_20190604_02.
* Calib A tank: samples TL_20190604_03 and TL_20190604_04.

Monday, June 3rd

Daily checks

  • Lab temperature = 23.0°C, AC temperature = 68F.
  • Case temperature: fast O3 = ~24.7°C, fast NOx = ~22.5°C.
  • PMT temperature: fast O3 = -35.0°C, fast NOx = -32.2°C.
  • Drierite: OK, change it probably later today or tomorrow morning.
  • Fast O3: OK, NO flow rate OK.
  • Fast NOx: OK but high counts (5000-5500).
  • Gas tanks: OK.
  • Fast O3 laptop synchronized with time.nist.gov at 8:18 AST.

Enclosure #2

  • Autosampler #2 connected to Anssi’s sample line in the tent.
  • Put a cap on sample line in the bag (remove O3 scrubber) and autosampler’s flow rate decreased to 0.02 L/min. No leak on the line.
  • valves temp = 40°C, cartriges temp = 35°C.
  • Set of 10 cartriges:
  1. 90987 - 6/3/2019 15:00 to 6/3/2019 17:00
  2. 4545 - 6/3/2019 17:30 to 6/3/2019 19:30
  3. 90971 - 6/3/2019 20:00 to 6/3/2019 22:00
  4. 781 - 6/3/2019 22:30 to 6/4/2019 00:30
  5. 90951 - 6/4/2019 1:00 to 6/4/2019 3:00
  6. 4645 - 6/4/2019 3:30 to 6/4/2019 5:30
  7. 655 - 6/4/2019 6:00 to 6/4/2019 8:00
  8. 4536 - 6/4/2019 8:30 to 6/4/2019 10:30
  9. 259 - 6/4/2019 11:00 to 6/4/2019 13:00
  10. 90601 - 6/4/2019 13:30 to 6/4/2019 15:30

Sunday, June 2nd

Saturday, June 1st

Daily checks

  • Lab temperature = 22.1°C, AC temperature = 68F.
  • Case temperature: fast O3 = ~22.9°C, fast NOx = ~18.1°C.
  • PMT temperature: fast O3 = -35.3°C, fast NOx = -34.2°C.
  • Drierite: OK.
  • Fast O3: OK, NO flow rate OK.
  • Fast NOx: OK.
  • Gas tanks: OK.
  • Fast O3 laptop synchronized with time.nist.gov at 8:17 AST.

Puff system

3 injections at (fast NOx time):
2019-06-01 08:34:35
2019-06-01 08:36:05
2019-06-01 08:37:56

Enclosure #2

I checked HOBO data.

GC/MS

  • Detlev made changes to the method yesterday (BVOC_SCAN_SIM_190531.M): the oven stays at 120°C between samples now and decreases to 35°C when the run starts (the lower we go, the better the earlier peaks such as isoprene are). Today, we increased the max temperature of the method to 260°C instead of 250°C. Note that we did not change the method’s name, still BVOC_SCAN_SIM_190531.M.

  • Today we updated the SIM time segments:

We also updated the peaks for each segments:
* alkanes + CFC-11: 41, 43 (alkanes) 101, 103 (CFC-11).
* isoprene: 67, 68.
* CFC-113: 101, 151.
* metacrolein + MVK: 41, 55, 70.
* aromatics (benzene, toluene, xylenes): 78, 91, 106.
* MT: 68, 93, 121, 136.
* SQT: 204, 91, 93, 119, 69.

  • We disconnected the GC/MS line (tee that also goes to slow O3). The GC/MS is now connected to the enclosure #2 outside. We checked that there’s not leak putting a cap on the line outside.
    Sample TL_20190601_01.
    TL_20190601_02 is NPL.

BVOC bags

Kaixin and Jacob collected ambient air samples in 4 different bags. Catie analyzed them on the TOF.